Air valve for gas burners



E. W. VEST.

AIR VALVE FOR GAS BURNERS.

APPLICATION men JULY 30. 1920.

1A1? JQUW Patented May 23, 1922.

AIR VALVE FOB SBUBNEHSJ tarmac Specification of LcttersPatent., P t t d M 23, 192% Original application filed December 13, 1919, serial No. 344,566. Divided and. this application filed July To all whom it may concern:

Be it known that I, EUGENE Vi Veer, a citizen of the United States, residing at Mulberry Grove, Bond County, dtate of Illinois, have invented certain new and useful Improvements in Air Valves for Gas Burners, of which the following is a specification con taining a full, clear, and exact description, reference being had to the accompanying drawings, forming a part thereof. a

My invention. consists in the novel di closure hereinafter particularly described and distinctly claimed.

This application 1s a division of a prior application filed by me on December 13 1919, Serial Number 344,566, for means for in ranges, I

- a joined to the outer end of the said mixingcontrolling the fuel and heat stoves and furnaces.

The object of mypresent invention is to provide an improved air-valve for the gas burners of ranges stoves and furnaces, in

which gasvalve; aBunsenburner; an air throat for said burner a slide-valve for con trolling the entrance of air to said throat, an adjustable-plate on the saidshde-valve,

to vary the normal opening into said air throat, a cam on the stem of said gas-valve; and a mechanical connection between sa1d cam and said slidevalve, to cause the movements of said gas-valve stem and said slidevalve to be simultaneous, n regulating the supply of an? and to the burner; and

whereby the turning up or downof the gas being quickly disassembled and reassembled in changing the size of said detachable tip;

1 according to the service required.

A further object of my invention is to pro vide an improved means whereby the dis charge rifice of the discharge-tip of the gasvalve cannot be completely closed, and the gas cannot be completely turned off at the tip, and the burner will operate upon arvery small quantitiy of gas, when turned down to the limit without the trouble of relighting.

Seria1 No. 400,148.

A. further object is to provide the gasvalve stem with a detachable and interchangeable shut-off tip.

In the drawings, 1

Fig 1 is a sectional side-elevation of my invention applied to a portion of a range or other gasfired apparatus, and

Fig. 2 is a detail front-elevation of my air-throat slide-valve and its operating cam.

. The numeral 1 designates the wall of the range, stove heater or furnace, to which the outer end of the usual mixing-pipe 2 of the burner is detachably connected.

A detachable gas-valve casting 3 is constructed with an air-throat 4;, and is connected to said wall 1 by having its shank inserted through an opening in saidwall and pipe 2 by means of a threaded coupling 5 into the threaded ends of which the adjacent ends of shank and said mixing-pipe are screwed, the said gas'valve casting being located, of course, uponthe exterior of the gasfired apparatus for convenienceduring use.

An important feature of my gas-valve construction is the detachable (and therefore interchangeable) gasdischarge tip '6, which is removably secured by screw-threads (or by any other common means) to the inner end of the horizontal gas-throat 7 of the said gasvalve casting 3, whereby the gas man or other attendant may quickly put on whatever size of tip he may think desirable for the service required; and also important is the further feature of making the tip 8 of the gas-valve stem 9 detachable, that it may be replaced by a larger or smaller, or by a longer or shorter tip, as required by the service. i y

. Astillfurther important construction is that the discharge-orifice of the said gasthroat tip 6 is so large that it cannot be completely closed by the said detachable ste1ntip which cooperates with it; whereby the gaswalvesteni 9 can be turned to almost shut off thegas, but cannot completely turn off the-gas at that point; thus enabling the burner to operate upon a very small quantity ofpgas when turned down to the limit, and avoiding the necessity of relighting the burner every time it has been turned down to its limit.

The numeral 10 designates the gas supply pipe, to which the said gas-throat 7 of said gas-valve casting is detachably connected by means of a common union 11 and shut-off cook 12.

A very quick opening and closing of the said gas-valve stem 9 is obtained by the use of a. coarse screw-thread thereon engaging correspondingthreads upon the interior of the stufiing-box member 14 of said gas-valve casting 3.

The customary stuifing-box gland 15 is threaded upon the outer threaded end of the said stufling-box member 14.

Simultaneous regulation of the entrance of air to the air-throat 4-, and of the gas supply to the said inixingpipe 2, is secured by a vertical slide-valve 16, having in its lower portion an air opening 17 which registers with said air-throat opening or entrance when said valve is moved to a position to uncover said entrance; the opposite edges of said valve being mounted to move in guides 18 located at the opposite sides of said airthroat; and a suitable mechanical connection between said valve and the said gasvalve stem 9, which will cause the latter and the valve to move in unison; whereby the turning up or down of the gas will also regulate the air, and produce the Bunsen [lame required for the most eliicient and economical operation of the burner. See Fig. 2.

In thepresent illustration of this part 01 my invention, I have provided a cam 1%), which is fixed on the said gas-valve stem 9 at a point between said stufiing-box gland 15 and the stem handle 20; said cam being fastened on said stem by means of a common set-screw 21 in such a manner that the posi tionof the cam may be changed when desired.

The said cam 19 is provided with an arcuate slot 22 whose walls are engaged by a projection 23 extending forwardly from the lower end of the said slide-valve 16 into the said slot.

With such construction, when the said gas-valve stem 9 is rocked or rotated the said cam will cause a corresponding move ment of the said slide-valve l6, and the air entrance of the said air-throat 4 will be more or less closed or opened.

The primary, or normal, relative positions or" the said cam 19 and the said air-valve 16 are, preferably, those in which they are shown in Fig. 2, so that even when the gasvalve handle is in a shut position there will be suflicient gas entering the burner to prevent its extinguishment, and also there should be a small opening (as shown) to the air throat, to enable a small quantity of air to enter there, to maintain the minimum combustion of gas. I

To facilitate the making of the proper adjustment between the said air-throat and said slide-valve, I place upon the trout lure of the latter an adjustable plate 21 which provided with a vertical slot 25 into which extends a guide-pin 2(3 .lixed at its inner end in the said slide-valve lti and engaging the opposite walls otsaid slot, to retain said adjustable plate in a vertical position.

A common cap-screw 21' also engages the walls oi said adjustablc-plate slot 2:), and is threaded into the said slide-valve 16 at a point below said guide-pin 26, so that the head of said screw will clamp said adjustable-plate upon said valve at the desired udjustment to produce the small primary uiropening into said air-throat 4 by way of the said opening 17 in said slide-valve.

By adjusting said plate on said slidevalve in the manner j ust described, the small primary opening of the said air-throat .1: may be quickly made, to produce the most economical operation of the burner, no matter what the pressure of the gas in the said gas supply-pipe 10 may be, and no matter what the vacuum of the chimney may be.

In other words, the said adjustuhle-platc 24 provides a quick and ellicicnt means 'l'or varying the size, o'l' the normal or primary opening into the said air-throat I of the gas-valve, to correspond, to the vacuum produced by the chinn'iey, as well as to lllillfl. said opening smaller or larger, according to the pressure in the gas supply-pipe.

To further facilitate the making ol? the proper adjustments of the air-valve plate 21 and the cam 19, I provide the trout face of: the said cam with a series of nuirlrs, or a scale, indicating the. minimum, the maximum and the intermediate number of cubic feet 01 to be consumed per hour, and these consist in the present case ol a series of unmerals 10, 20, 30, '10, 50. (30, TU and R0.

Adjustablestops. in the term of common split-pins 28, in the present instance. are mounted upon said cam 19. dctaehahly in radial holes 29 bored in the edge o I said cum, so that said pins will extend across the said slot 22 of said cam at the desired points in the length of the latter, and limit the movement thereof from its minimum to its maximum setting-points.

The operation of my invention will be clear, without further description.

A common reticulated cone-slmped strainer 30, made of wire cloth or other suitable material, is fixed in the said air-throat l of said gasvalve casting 3, to act as a strainer for the entering air, and to prevent bachfiring.

I claim An air and gas valve for the burners of stoves, ranges and furnaces, comprising a Bunsen gas-burner casting, a gas-valve stem, an air-throat, an air-valve arranged to control the entrance of air to saidainthroat, a cam on said gas-valve stem, a connecting means between said cam and said air velve name to this specification in. the presence of whereby both will move simultaneously two witnesses. when said. stem is rocked 0r rotated and an i q 1 1 1 r adjustable plate on said air-valve, for vary- LUQENL VLSI" ing the size of the normal opening to satic'l Witnesses: air-throat. IDA PHILLIPS,

In testimony whereof, I have signed my I JOHN G. HIGDON. 

